The phrase "colony members" refers to the individuals who live together in a group called a colony. They work together, share resources, and have specific roles or jobs within the colony. Full definition
It is uncommon for new cats to join an existing colony and the existing colony members can no longer reproduce. (peninsulacatworks.org)
This is because infectious diseases can spread easily among colony members, who live closely together, and may lead to the death of the entire colony if infections are not contained. (sciencedaily.com)
Know who your regular / core colony members are versus occasional visitors from the neighborhood. (solanoferals.org)